1. Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, B-dul. Eroii Sanitari, 8, 050474 Bucharest, Romania
2. Gastroenterology Department, Emergency Clinical Hospital Bucharest, Calea Floreasca, 8, 014461 Bucharest, Romania
3. Internal Medicine & Gastroenterology Department, University Emergency Hospital of Bucharest, Splaiul Independenței, 169, 050098 Bucharest, Romania
4. Gastroenterology Department, Fundeni Clinical Insititute, Soseaua Fundeni, 258, 022328 Bucharest, Romania